Elliptical Gasket Leakage in Class 150 LB Gate Valves

We have analyzed the cause of on-site leakage, despite the Class 150LB gate valve passing multiple pressure tests.

Structural Issues of the Elliptical Gaskets

Material Issues of the Elliptical Gaskets

Cause of Flange Warping Deformation

Reason for No Air Leakage After Hydrostatic Testing

Leakage Caused by On-site Flange Warping Deformation

Methods to Improve Flange Warping Deformation

Using corrugated gaskets or reinforcing the middle flange strength can improve sealing performance. However, both increase manufacturing costs and cannot quickly change the inherent nature of existing raw castings.

Improvement of Elliptical Gasket with Metal Flat Plate Composite

Methods to Verify Improvement of Flange Warping Deformation